Glue gun



FIG. 1 is a front view of a glue gun showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is bottom view thereof; and,

FIG. 7 is a perspective view thereof showing the top, front, and left sides.

The broken lines in FIG. 6 depict portions of the glue gun in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for a glue gun, as shown and described. 